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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2021
PROPERTY, PLANT AND EQUIPMENT |
PROPERTY, PLANT AND EQUIPMENT | 7. PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment consisted of the following at December 31, 2021 and 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2021 | ​ | 2020
Land | ​ | $ | 14,949 | ​ | $ | 12,968
Buildings and leasehold improvements | ​ |  | 13,722 | ​ |  | 10,700
Vehicles | ​ |  | 1,682 | ​ |  | 1,664
Machinery and equipment | ​ |  | 5,058 | ​ |  | 4,127
Furniture and fixtures | ​ |  | 298 | ​ |  | 298
Total | ​ |  | 35,709 | ​ |  | 29,757
Less accumulated depreciation | ​ |  | (8,193) | ​ |  | (7,141)
Total property, plant and equipment | ​ | $ | 27,516 | ​ | $ | 22,616
​ Depreciation expense was $1,145 with $450 included as a component of cost of product sales for the year ended December 31, 2021 and $1,013 with $409 included as a component of cost of product sales for the year ended December 31, 2020.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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